Reading data from Character data

Question

Reza Tavakoli 2021-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/777437-reading-data-from-character-data

评论： Reza Tavakoli 2021-3-19

Hi,

I need to read a csv file from a directory. Name of the file is an output of a code which is written on a charecter or string data.

How can I write a code which reads the name of the file from character data and then find the file in the direcotory and load it.

let's say the charecter data name is 'MyFile' and name of the file that I need to read from the directory is 'File No.3'. The direcotry is a folder in one of my laptop drives. basically my code should be something like belwo but this is not working:

Data=readtable("G:\operations\'MyFile'");

Thanks for any assistance

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Answer 1

Walter Roberson 2021-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/777437-reading-data-from-character-data#answer_652302

在 MATLAB Online 中打开

projectdir = 'G:\operations';
MyFile = 'File No.3';
filename = fullfile(projectdir, MyFile);
Data = readtable(filename);

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Walter Roberson 2021-3-19

在 MATLAB Online 中打开

What we know is the file name is written on 'MyFile' charecter type.

I do not know what you mean by that, unless you mean that the variable named MyFile contains the file name. And if that is what you mean, then that is what my sample code already takes care of.

Do I need to show more clearly that MyFile does not have to be a fixed constant?

projectdir = 'G:\operations';
MyFile = sprintf('File No.%d', randi(9));    %file name can be computed
filename = fullfile(projectdir, MyFile);
if ~exist(filename)
   error('Oh, darn, file "%s" does not exist', filename);
end
Oh, darn, file "G:\operations/File No.5" does not exist
Data = readtable(filename);